Played Flight Sim and Starfield for 3+ hours, battery charged from 80% to the 95% I have it capped at.
Also did some video up-scaling stuff that was a few hour job without battery drain.
I was the person running the linked YouTube channels post on Reddit, running a Timespy benchmark looping, and had my battery charge not drain while it was running.
I’m running the 7700S GPU and the 7840HS CPU. Maybe its an issue with the the 7940HS pulling more power than the 7840 can.